Failure on startup fatal error

Caused by Bug 2067 (7e83fd92)

Source commit: 4cb83a195a281fc0ad3c29309a9190d05ed40b77

source/windows/UserInterface.cpp

@@ -109,7 +109,7 @@ void __fastcall SetOnForeground(bool OnForeground)
 void __fastcall FlashOnBackground()
 {
   DebugAssert(Application);
-  if (WinConfiguration->FlashTaskbar && !ForcedOnForeground && !ForegroundTask())
+  if ((WinConfiguration != NULL) && WinConfiguration->FlashTaskbar && !ForcedOnForeground && !ForegroundTask())
   {
     FlashWindow(Application->MainFormHandle, true);
   }